I was given an Antec Smartpower 500w modular PSU, but not all of the modular cables were included. Is it possible to buy modular power supply cables by themselves? Included with this PS were an IDE power cable with 3 connectors and an SATA power cable with 2 connectors. This is enough to get me started but I'm concerned about PCIe power once I upgrade the video card. I'll be starting with a spare PCIe NV 7300gs card that does not require additional power, but will be upgrading to either the 8800GT or HD3870 after the new year. I want to be sure I'll be able to run either of these cards.

I emailed antec from a link on their website, and they sent me some spare parts for my super lanboy case. Try it.

Yep. Antec is very good about this.